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Posted to dev@lucene.apache.org by "Robert Muir (JIRA)" <ji...@apache.org> on 2012/06/10 14:41:42 UTC
[jira] [Commented] (LUCENE-4127) negative offsets/deltas
corrumption
[ https://issues.apache.org/jira/browse/LUCENE-4127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292510#comment-13292510 ]
Robert Muir commented on LUCENE-4127:
-------------------------------------
just my opinion, I tend towards #1 here. I think offsets should be strongly typed (they are the character offsets),
and we should enforce this so that highlighting actually works.
if people want a place to dump opaque data per-position, they can just use the payload for that.
> negative offsets/deltas corrumption
> -----------------------------------
>
> Key: LUCENE-4127
> URL: https://issues.apache.org/jira/browse/LUCENE-4127
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0
> Reporter: Robert Muir
> Attachments: LUCENE-4127_test.patch
>
>
> If offsets go negative or backwards, it can corrupt the index with DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS: the offsets will have wrong values (different from the term vectors) or even crazy values like -2147483645
> The problem with this is that its not just theoretical: its too easy to do this with lucene's own analyzer chains (e.g. ngramtokenizer).
>
> See issues such as LUCENE-3920 and some discussion on LUCENE-3738
> The question is how to fix this, e.g. should we:
> # start enforcing that offsets cannot be crazy values in OffsetAttributeImpl/IndexWriter and fix the broken analyzers
> # leave offsets as a pair of opaque integers, declaring this a limitation of the current codec, and either workaround or throw UOE from the postings writer.
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